Have no idea

verb

Definitions

Verb
  1. 1
    To not know at all.
  2. 2
    To be mistaken; to not have a correct idea.

    "For both Margaret Thatcher in the UK and Ronald Reagan in the US, what was to blame for the slump in the late-1970s^([sic]) was clear (though we now know they really had no idea)."

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